Oscar Pistorius did not have a mental health problem when he killed his girlfriend Reeva Steenkamp on Valentine's Day last year, his murder trial has heard.

Pistorius' trial resumed today after the Olympic and Paralympic athlete underwent a 30-day psychiatric evaluation, during which a panel of experts assessed his mental state at the time of the shooting and whether Pistorius was capable of understanding the wrongfulness of the act.

Oscar Pistorius' murder trial has heard the athlete's "ability to ward off danger is impaired" when he is not wearing his prosthesis.

Dr Versfeld told the high court in Pretoria, "While I would expect that he could carry a cricket bat ... I don't believe that he would be able to strike anything with that cricket bat with any type of force ... because he would overbalance and fall down."